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Investment Securities - Contractual Maturities of Investment Securities (Details 3) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Available for Sale Amortized Cost      
Due within one year     $ 61,064
Due over one to five years $ 1,501,359 $ 2,995,525 5,938,706
Due over five to ten years 1,054,391   2,007,824
Due over ten years 33,278,638 29,635,572 32,957,092
Mortgage-backed, due in monthly installments 60,109,799 66,659,924 46,859,454
Amortized Cost 95,944,187 99,291,021 87,824,140
Available for Sale Fair Value      
Due within one year     61,780
Due over one to five years 1,506,660 2,991,485 5,923,560
Due over five to ten years 1,017,123   2,004,890
Due over ten years 32,828,304 29,996,099 33,611,161
Mortgage-backed, due in monthly installments 59,254,489 65,802,426 46,391,754
Available-for-sale Securities, Fair Value $ 94,606,576 $ 98,790,010 $ 87,993,145